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Hi,
I am using the part :ADS8328. In my design we are having 2.8V rail. I would like to know whether can I use REF3425 to provide a reference voltage to my ADS8328? I am more concerned of the power consumption and voltage drop of 0.3(2.8-2.5)
If not REF3425, Please suggest any other IC.
https://www.ti.com/product/ADS8328?keyMatch=ADS8328&tisearch=search-everything&usecase=GPN
https://www.ti.com/product/REF3425?keyMatch=REF3425&tisearch=search-everything&usecase=GPN
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Thanks,
Ashok
Hello Ashok,
Welcome to our forum and thank you for your post!
It looks like the REF3425 would be fine with 300 mV of dropout voltage. The only restriction I see is that this device cannot support the full 10-mA output current load on its own at 125C with less than 400 mV VDO.
The average load current for the reference pin is around 25-45 uA depending on the reference input impedance. There will be spikes of instantaneous current drawn from the REF+ pin during the ADC conversion phase, but this is partially handled by adding decoupling capacitors across the reference pins and, therefore, should not be a concern. The data sheet recommends using 10 uF, but I would also advocate for an additional 0.01 uF in parallel placed closest to the ADC.
Best regards,
Ryan